This drawing covers the Mendip Hills, from Wrington to Wells. Pencil rays extend from the left of the map towards Red Hill, on the right, and Mark and Tillham, on the bottom right. The draughtsman used these lines to measure relative distance and to plot locations by triangulation. Masberry Castle is shown in the bottom right, on top of a hill whose steepness is indicated by soft brushwork interlining ('hachuring'). The castle path joins the main turnpike road, whose length is annotated at intervals of one mile. Many field boundaries are marked in red, denoting stone walls rather than corrections in this case.